- DeZurik- Metal Seated and Soft Seated Knife Gate, O Port Gate, Coal Burner, Unival, Unidirectional
- Fabri-Valve- Metal and Soft Seated Knife Gate Designs
- Trueline- Metal Seated and Soft Seated Knife Gate, Slide Gate and O Port, Scavenger Service, Square Port Hi-Density Clean Out
- Wey Valve- Knife Gate, Square Port